205140245 has 16 divisors (see below), whose sum is σ = 259775040. Its totient is φ = 155084544.

The previous prime is 205140223. The next prime is 205140251. The reversal of 205140245 is 542041502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 205140245 - 2⁶ = 205140181 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205140245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38642 + ... + 43628.

It is an arithmetic number, because the mean of its divisors is an integer number (16235940).

Almost surely, 2^205140245 is an apocalyptic number.

It is an amenable number.

205140245 is a deficient number, since it is larger than the sum of its proper divisors (54634795).

205140245 is a wasteful number, since it uses less digits than its factorization.

205140245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 205140245 is about 14322.7177937708. The cubic root of 205140245 is about 589.7712845178.

Adding to 205140245 its reverse (542041502), we get a palindrome (747181747).

The spelling of 205140245 in words is "two hundred five million, one hundred forty thousand, two hundred forty-five".